Post Office Ltd Data Breach History

This page tracks the Post Office Ltd data breach history and cybersecurity incidents affecting Post Office Ltd (United Kingdom). BreachHistory currently indexes 1 publicly disclosed or catalogued incident spanning 2024, with approximately 555 records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The Post Office Ltd breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest Post Office Ltd Data Breaches

The largest indexed incidents include the 2024 Post Office — 555 Horizon victims published. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Post Office Ltd or a regulator. Below is the list of large data breaches:

• 2024 2024 Post Office — 555 Horizon victims published — about 555 records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include names, physical addresses, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Post Office Ltd Data Breach 2026

At the time of this update, no Post Office Ltd data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a Post Office Ltd data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This Post Office Ltd breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.